Gas meter



June 30, 1931. H. GERDES 1,812,333

GASMETER Filed May 22, 1926 d'nremak: fiz'nr h Games.

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This invention relates to gas meters, and more articularly to the dry form of meter. In t e case of dry gas meters it is usual to em loy one or more membranes composed of abrie or leather, which divide the cas ng of the meter into two or more measuring chambers. The movement of the membrane occasioned by the alternate filling of the measuring chambers with gas is employed 1. for opening and closing the inlet and outlet valves, and for actuating the counting mechanism. It has hitherto been usual o secure the membrane either to the wall ofthe cas 'ing, or to interior parts of the meter. Damage to the membrane accordingly necessitates the meter being taken entirely apart whereby the operation of interchanging the membrane is a length and costly matter, quite apart from the act that on y skilled go workers can be employed forthis job, and

a fresh graduation is also required.

It is therefore desirable to arrange the membrane in' suchmanner that the same, after the casing has been opened, ma be as readily interchanged by uns 'lled wor ers, without necessity or removal of the interior parts of the meter, whereby the size of the measuring chamber remains the same.

This is accomplished according to the ingo vention by securing the membrane to an annular or other shaped metal portion, for example by firmly binding or in other suitable manner, and fitting the two parts (ring and membrane) together into the measuring chamben' r The invention will now be described more fully with'reference to the accompan ing :drawings, in the various figures o w ich similar reference characters are employed to denote like parts. 1

Fig. 1, being a cross-section, shows one form of embodlment for carrying the invention into effect.

Figs.,2 and 3, also cross-sections, show two further forms of embodiment.

With reference to Fig. 1, the membrane 1 is held in an annular groove 2 in the ring 3 by binding or a resilient ring, the ring 3 beg simply fitted into the measuring chamao ber4. I

In the case of the embodiment according to Fig. 2, the method of securing the membrane 1 to the ring 3 is the same as in the previous example, in this instance, however the lower edge of the ring 3 bein furnished with slots so that the ring, which is held in the rounding 5 of the part 4, acts in the manner of a spring ring, thus providing a better connectlon between 1 the two' parts. The connection may be made more gastight b passing the loose edge of the-membrane 1 a out the lower edge of the ring, and using the same as a packing.

A still more gastight 1 connection between the ring 3 and the chamber 4 is shown in Fig. 3. After insertion of the ring 3 into the chamber 4, the edge of the membrane 1 is secured by binding in an annular groove 6 in the chamber 4. This embodiment provides a clean and tight connection between the membrane 1, the ring 3 and the measuring chamber 4.

The method of mounting the membrane described in the above allows, after the casing of the meter has been opened, the membrane to be readily interchanged, without necessity for removing from the casing the interior parts of the meter.

What I claim as new and desire to secure by Letters Patent is:

1. A dry gas meter'comprisin'g a meter casing having a cylindrical portion provided with an annular groove, a ring having a resilient annularridge coacting with said annular groove, said ring being provided with an annular groove, a diaphragm positioned across said ring and means maintaining said diaphragm positioned, comprising a resilient ring frictionally holding said diaphragm in said annular groove of said ring.

2. In a dry gasmeter, in combination, a meter casing having a cylindrical portion provided with an annular groove, a ring having a resilient annularridge coacting with said annular groove, said ring being provided with an annular groove, a diaphragm positioned across said ring and means maintaining. said diaphragm positioned,-compris- 100 ing a resilient ring1 diaphragm in sai annular opve said ring, said diaphragm bein fnctlonally held between said resilient annu ar ridge and said annular groove of said meter casin In testimony whereof I have a ed my signature.

HEINRICH GERDES.

frictionally holdin said 

